Power tool

Abstract

The utility model relates to a power tool, include: output shaft is equipped with the shoulder, first bearing, sleeve joint in output shaft and be located the rear of shoulder, operating part, can adjust the output state of output shaft through the rotation of occurrence, first limit piece, the sleeve of output shaft is pressed in first bearing along the direction of power tool from front to back, second limit piece, the sleeve of output shaft is pressed in operating part along from front to back, first limit piece and second limit piece all are located the rear of shoulder, chuck assembly, it includes chuck main part and locking element, chuck main part abuts at the shoulder along from front to back, wherein, limit first plane is with the axis of output shaft vertical plane, the projection of second limit piece and shoulder both on first plane does not overlap, the projection of first limit piece and operating part on first plane does not overlap. The utility model discloses a power tool, is equipped with first limit piece and second limit piece, so that the disassembly of operating part is more simple and convenient, laborsaving, fast.

Description

Technical Field

[0001] This utility model relates to the field of power tool technology, and in particular to a power tool. Background Technology

[0002] Power tools are widely used due to their high torque and ease of use, commonly used for drilling and screwing. A power tool mainly consists of a motor, a planetary gear train, an output shaft, a clutch assembly, and a torque adjustment assembly. The planetary gear train is mounted in a gearbox, and the output shaft is mounted in the gearbox via bearings. The rotational power output by the motor is reduced in speed by the planetary gear train and then transmitted to the output shaft, causing the output shaft to drive the tool head (e.g., a tool head) to rotate for operation. The clutch assembly typically includes a clutch ball, a clutch spring, and a clutch washer. The clutch washer is located between the clutch ball and the clutch spring, and the clutch ball abuts against the internal gear ring of the planetary gear train along the front-to-back direction of the power tool.

[0003] The torque adjustment assembly includes an operating component and a torque adjustment component. The operating component is rotatably mounted on the gearbox. The torque adjustment component applies a counterforce to the clutch spring, causing the clutch spring to press the clutch shim against the clutch ball. By rotating the operating component, the user adjusts the counterforce applied to the clutch spring by the torque adjustment component, thereby adjusting the force exerted by the clutch ball against the internal gear ring to achieve torque adjustment.

[0004] If the initial position of the operating part is abnormal during the use of the power tool, the scale position on the operating part will be abnormal, and the cooperation between the operating part and the torque adjustment part will also be abnormal. In this case, the operating part needs to be removed, the initial position of the operating part calibrated, and then the operating part reinstalled.

[0005] Existing power tools are equipped with a pressure plate that fits around the outer circumference of the output shaft and presses against the bearings of the operating component and the output shaft respectively in a front-to-back direction to restrict the forward movement of the operating component and the bearings. Furthermore, the chuck assembly of the power tool abuts against a shoulder provided on the outer circumference wall of the output shaft in a front-to-back direction to improve the stability of the chuck assembly after installation. However, because the pressure plate is located between the bearing and the shoulder of the output shaft, and to ensure that the pressure plate can stably press against the bearing of the output shaft, the distance between the inner wall of the pressure plate and the outer wall of the output shaft is relatively small to maximize the contact area between the pressure plate and the bearing of the output shaft. This makes it difficult for the pressure plate to pass over the shoulder of the output shaft in a back-to-forward direction. In other words, the pressure plate will be stuck by the shoulder of the output shaft during the process of removing it from the output shaft, making it difficult to remove the pressure plate, and consequently, difficult to remove the operating component. Utility Model Content

[0006] Based on the aforementioned deficiencies in the prior art, the purpose of this utility model is to provide a power tool equipped with a first limiting member and a second limiting member to restrict the forward movement of the first bearing and the forward movement of the operating member, respectively. Furthermore, the second limiting member is positioned relative to the shoulder and the first limiting member is positioned relative to the operating member, making the disassembly of the operating member simpler, less strenuous, and faster.

[0007] Therefore, the present invention provides the following technical solution.

[0008] This utility model provides a power tool, the power tool comprising:

[0009] An output shaft for driving the drill bit to rotate and having a shoulder and a mounting portion located in front of the shoulder;

[0010] A first bearing is sleeved on the output shaft and located behind the shoulder;

[0011] A chuck assembly is disposed at the mounting portion of the output shaft, and the chuck assembly abuts against the shoulder in a front-to-back direction of the power tool;

[0012] An operating element that can be rotated to adjust the output state of the output shaft;

[0013] A first limiting member is sleeved on the output shaft and presses against the first bearing in the direction from front to back of the power tool to prevent the first bearing from moving forward.

[0014] The second limiting member is sleeved on the output shaft and presses against the operating member in the direction from front to back to prevent the operating member from moving forward; both the first limiting member and the second limiting member are located behind the shoulder.

[0015] Specifically, the first plane is defined as a plane perpendicular to the axis of the output shaft, the projections of the second limiting member and the shoulder on the first plane do not overlap, and the projections of the first limiting member and the operating member on the first plane do not overlap.

[0016] Optionally, the power tool further includes:

[0017] A speed reduction mechanism, the output end of which is used to drive the output shaft to rotate;

[0018] A gearbox, which houses the reduction mechanism;

[0019] The operating component is rotatably mounted on the gearbox in the front-to-back direction, and the outer peripheral wall of the first bearing is mounted on the inner wall of the gearbox.

[0020] Optionally, the second limiting member presses against the first limiting member in the front-to-back direction, so that the first limiting member presses against the first bearing in the front-to-back direction.

[0021] Optionally, the power tool further includes a reduction gearbox, and the second limiting member, the first limiting member, and the reduction gearbox are distributed sequentially along the front-to-back direction, with the second limiting member connected to the reduction gearbox.

[0022] Optionally, the first limiting member partially abuts against the gearbox;

[0023] The power tool also includes fasteners that pass sequentially through the second limiting member and the first limiting member and are fastened to the gearbox.

[0024] Optionally, the first limiting member and the gearbox are connected by a first limiting hole and a first limiting protrusion to achieve positioning and pre-installation;

[0025] And / or, the first limiting member and the second limiting member are connected by a second limiting hole and a second limiting protrusion to achieve positioning pre-assembly;

[0026] And / or, the rear end of the second limiting member is provided with an annular protrusion and a first groove surrounded by the annular protrusion, the annular protrusion abutting against the operating member in the direction from front to back, and the first limiting member is at least partially embedded in the first groove.

[0027] Optionally, the front end of the operating member is provided with a second groove, and the second groove is provided with a first protrusion;

[0028] The second limiting member has a second protrusion, and the second limiting member is at least partially embedded in the second groove. The second limiting member abuts against the groove wall of the second groove in the direction from front to back.

[0029] When the operating member is in the initial position, the second protrusion abuts against the first protrusion along the rotatable direction of the operating member;

[0030] And / or, the first limiting member is annular;

[0031] And / or, the second limiting member is annular.

[0032] Optionally, the projection portions of the first limiting member and the shoulder on the first plane overlap.

[0033] Optionally, the chuck assembly includes a chuck body and a locking element. The chuck body abuts against the shoulder in the front-to-back direction. The chuck body has a radial through hole, and the locking element is movably inserted into the radial through hole. The locking element is used to radially press the output shaft inserted in the chuck body to lock the chuck assembly to the output shaft.

[0034] Optionally, the chuck body includes a quick-release hollow cylindrical part and a clamping part, the clamping part being used to clamp the tool head; the quick-release hollow cylindrical part is sleeved on the outer periphery of the output shaft, and it abuts against the shoulder in the front-to-back direction, the chuck assembly rotating with the output shaft;

[0035] The length of the portion of the quick-assembly hollow cylinder that contacts the shoulder in the radial direction of the quick-assembly hollow cylinder is L1, and the wall thickness of the quick-assembly hollow cylinder is t1. L1 is greater than or equal to half of t1.

[0036] Optionally, the power tool further includes a cornering device, which includes a first end and a second end whose extension directions intersect, the first end being used to detachably mount the chuck assembly;

[0037] The second end is provided with a first tooth, and the front end of the second limiting member is provided with a second tooth. The second tooth is used to engage with the first tooth to prevent the angler from rotating with the output shaft. The angler is used to change the rotational drive direction of the output shaft by a preset angle and then transmit it to the drill bit.

[0038] This utility model also provides a power tool, the power tool comprising:

[0039] The output shaft is used to drive the drill bit to rotate and it is provided with a shoulder;

[0040] A first bearing is sleeved on the output shaft and located behind the shoulder;

[0041] An operating element that can be rotated to adjust the output state of the output shaft;

[0042] A first limiting member is sleeved on the output shaft and presses against the first bearing in the direction from front to back of the power tool to prevent the first bearing from moving forward.

[0043] The second limiting member is sleeved on the output shaft and presses against the operating member in the direction from front to back to prevent the operating member from moving forward; both the first limiting member and the second limiting member are located behind the shoulder.

[0044] Specifically, the first plane is defined as a plane perpendicular to the axis of the output shaft, the projections of the second limiting member and the shoulder on the first plane do not overlap, and the projections of the first limiting member and the operating member on the first plane do not overlap.

[0045] This utility model has the following technical effects:

[0046] This utility model provides a power tool equipped with a first limiting member and a second limiting member to restrict the forward movement of a first bearing and the forward movement of an operating member, respectively. Furthermore, it defines the positional relationship between the second limiting member and the shoulder, and the positional relationship between the first limiting member and the operating member. Thus, the disassembly of the second limiting member is not affected by the protrusion height of the shoulder, and the disassembly of the operating member is not restricted by the first limiting member. This allows for easy installation and removal of the second limiting member while maximizing the protrusion height of the shoulder, thereby enabling easy removal of the operating member. In the event of an abnormal initial position of the operating member, it can be easily and quickly removed, aligned with the initial position, and reinstalled. The operation is simple, labor-saving, and fast. Attached Figure Description

[0047] Figure 1 This is a three-dimensional structural diagram of the power tool in the first embodiment of the present invention;

[0048] Figure 2 This is a structural cross-sectional view of the power tool in the first embodiment of the present invention. Figure 1 ;

[0049] Figure 3 This is a structural cross-sectional view of the power tool in the first embodiment of the present invention. Figure 2 ;

[0050] Figure 4 for Figure 2 Enlarged view of point A in the middle;

[0051] Figure 5 for Figure 3 Enlarged view at point B in the middle;

[0052] Figure 6 This is a partial three-dimensional view of the power tool in the first embodiment of the present invention;

[0053] Figure 7 This is an exploded view of a partial structure of the power tool in the first embodiment of the present invention. Figure 1 ;

[0054] Figure 8 This is a partial exploded view of the power tool of this utility model. Figure 2 ;

[0055] Figure 9This is a three-dimensional structural diagram of the second limiting member of this utility model;

[0056] Figure 10 This is a three-dimensional structural diagram of the power tool in the second embodiment of the present invention;

[0057] Figure 11 This is a three-dimensional structural diagram of the clamp assembly in the second embodiment of the present invention.

[0058] Explanation of reference numerals in the attached figures

[0059] 100. Power tools;

[0060] 1. Output shaft; 11. Shoulder; 12. Torque output end; 13. Torque input end; 14. Locking groove;

[0061] 21. First bearing; 22. Second bearing;

[0062] 31. Operating component; 311. Second groove; 312. Internal thread; 3111. First protrusion; 32. Torque adjusting component; 321. External thread;

[0063] 4. First limiting component; 41. First limiting hole; 42. Second limiting hole;

[0064] 5. Second limiting member; 51. Annular protrusion; 52. First groove; 53. Second protrusion; 54. Second tooth; 55. Second limiting protrusion;

[0065] 61. Reduction mechanism; 611. Final stage internal gear ring; 62. Reduction gearbox; 621. First limit protrusion; 622. Annular groove;

[0066] 7. Fasteners;

[0067] 81. Chuck assembly; 811. Chuck body; 8111. Quick-release hollow cylinder; 8112. Clamping part; 8113. Radial through hole; 812. Locking element; 813. Angle switch housing; 8131. First end; 81311. First tooth; 8132. Second end; 814. Angle output shaft;

[0068] 91. Motor; 92. Housing; 93. Clutch assembly; 931. Clutch ball; 932. Clutch spring; 933. Clutch shim. Detailed Implementation

[0069] To make the technical solution and beneficial effects of this utility model more apparent and understandable, a detailed description is provided below by listing specific embodiments. Unless otherwise defined, the technical and scientific terms used herein have the same meanings as those in the technical field to which this application pertains.

[0070] In the description of this utility model, unless otherwise expressly defined, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "height", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the purpose of simplifying the description of this utility model and do not indicate that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. That is, they should not be construed as limitations on this utility model.

[0071] In this utility model, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating the relative importance of the indicated features or the number of indicated technical features. Therefore, a feature specified as "first" or "second" can explicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two; "several" means at least one; unless otherwise expressly defined.

[0072] In this utility model, unless otherwise explicitly defined, the terms "installation," "connection," "linking," "fixing," and "setting," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral molding; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can also refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0073] In this utility model, unless otherwise explicitly defined, the terms "above," "on top of," "above," "over," "below," "below," "below," or "below" for "first feature above second feature" can refer to direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Furthermore, "above," "above," and "over" for "first feature above second feature" can mean the first feature is directly above or diagonally above the second feature, or simply indicates that the horizontal height of the first feature is higher than the horizontal height of the second feature. Similarly, "below," "below," and "below" for "first feature below second feature" can mean the first feature is directly below or diagonally below the second feature, or simply indicates that the horizontal height of the first feature is lower than the horizontal height of the second feature.

[0074] In this utility model, "front," "rear," "left," "right," "up," and "down" all refer to... Figures 1 to 3 , Figure 10 The markings in the text shall prevail.

[0075] The following is based on Figures 1 to 11 This utility model describes the power tool in detail.

[0076] First Implementation Method

[0077] The following is based on Figures 1 to 9 The power tool in the first embodiment of this utility model is described in detail.

[0078] In this embodiment, such as Figures 1 to 8 As shown, the power tool 100 includes an output shaft 1, a first bearing 21, an operating member 31, a first limiting member 4, a second limiting member 5, a reduction mechanism 61, a chuck assembly 81, a motor 91, and a housing 92. The output shaft 1 has a shoulder 11. When the power tool 100 is in operation, the motor 91 outputs rotational driving force, and the reduction mechanism 61 reduces the rotational speed of the motor 91 before transmitting the power to the output shaft 1. One end of the output shaft 1 extends outside the housing 92 to drive the tool head to rotate. The first bearing 21 is located behind the shoulder 11 and is sleeved on the output shaft 1, supporting the output shaft 1.

[0079] The operating element 31 can be rotated to adjust the output state of the output shaft 1. For example, the operating element 31 can be rotated to adjust the output torque of the output shaft 1, or the operating element 31 can be rotated to adjust the speed of the output shaft 1, i.e., gear adjustment.

[0080] like Figure 2 , Figure 4 , Figure 6 and Figure 7As shown, the chuck assembly 81 includes a chuck body 811 and a locking element 812. The locking element 812 can be a locking ball or a locking pin. One end of the chuck body 811 is used to clamp a tool head (such as a drill bit), and the other end of the chuck body 811 is used to detachably connect to the output shaft 1. In this way, the power output by the output shaft 1 is transmitted to the tool head via the chuck body 811. Specifically, the chuck body 811 is provided with a radial through hole 8113, and the locking element 812 is movably inserted into the radial through hole 8113. The output shaft 1 is provided with a locking groove 14 on its circumferential outer wall. When assembling the chuck assembly 81 with the output shaft 1, one end of the chuck body 811 is first sleeved on the end of the output shaft 1 that extends into the housing 92. Then, the locking element 812 is radially inserted into the locking groove 14 under external force (such as under the elastic force of the elastic sleeve). The locking element 812 presses the output shaft 1 to lock the chuck assembly 81 onto the output shaft 1. The locking element 812 can prevent the chuck assembly 81 from disengaging from the output shaft 1. When the output shaft 1 rotates, the chuck assembly 81 rotates with the output shaft 1. To improve the stability of the chuck assembly 81 mounted on the output shaft 1, the chuck body 811 abuts against the shoulder 11 in the direction from front to back along the power tool 100. The shoulder 11 abuts against the chuck body 811 forward to prevent the chuck body 811 from moving backward. Furthermore, to further improve the stability of the chuck assembly 81, the protrusion height of the shoulder 11 should be as high as possible.

[0081] like Figure 4 As shown, both the first limiting member 4 and the second limiting member 5 are located behind the shoulder 11. The first limiting member 4 is sleeved on the output shaft 1 and presses against the first bearing 21 in the direction from front to back of the power tool 100 to prevent the first bearing 21 from moving forward. The second limiting member 5 is sleeved on the output shaft 1 and presses against the operating member 31 in the direction from front to back to prevent the operating member 31 from moving forward. The first plane is defined as a plane perpendicular to the axis of the output shaft 1. The projections of the second limiting member 5 and the shoulder 11 on the first plane do not overlap, and the projections of the first limiting member 4 and the operating member 31 on the first plane do not overlap.

[0082] In the above technical solution, the power tool 100 is equipped with a first limiting member 4 and a second limiting member 5, which are used to limit the forward movement of the first bearing 21 and the forward movement of the operating member 31, respectively. Furthermore, the positional relationship between the second limiting member 5 and the shoulder 11 and the positional relationship between the first limiting member 4 and the operating member 31 are also limited. In this way, the disassembly of the second limiting member 5 is not affected by the protrusion height of the shoulder 11, and the disassembly of the operating member 31 is not limited by the first limiting member 4. The second limiting member 5 can be easily installed and removed while maximizing the protrusion height of the shoulder 11. This allows the operating member 31 to be easily removed. In the event of an abnormality in the initial position of the operating member 31, the operating member 31 can be easily and quickly removed, aligned with the initial position, and reinstalled. The operation is simple, labor-saving, and fast.

[0083] It should be understood that the power tool 100 in this application includes, but is not limited to, electric drills, electric hammers, electric starters, electric wrenches, and multi-tools. The solution of this application can be applied to any tool that requires the use of a chuck assembly 81 to clamp the tool head and the chuck assembly 81 and the output shaft 1 to be quickly connected using a locking element 812.

[0084] In one implementation, such as Figure 2 and Figure 4 As shown, the power tool 100 also includes a reduction gearbox 62, which houses a reduction mechanism 61. The output end of the reduction mechanism 61 drives the output shaft 1 to rotate. The reduction mechanism 61 may include a single-stage planetary gear system or a multi-stage planetary gear system. The reduction mechanism 61 reduces the speed output by the motor 91 and transmits it to the output shaft 1. The operating member 31 is rotatably fitted onto the reduction gearbox 62 in a front-to-back direction. The reduction gearbox 62 is used to mount the operating member 31. In one specific embodiment, the reduction gearbox 62 has an annular groove 622. The operating member 31 is fitted onto the reduction gearbox 62, and the rear end of the operating member 31 is rotatably inserted into the annular groove 622. The reduction gearbox 62 can also prevent the operating member 31 from moving backward. Thus, the second limiting member 5 cooperates with the reduction gearbox 62 to limit the movement of the operating member 31 in the front-to-back direction. The outer peripheral wall of the first bearing 21 is mounted on the inner wall of the reduction gearbox 62.

[0085] In one implementation, such as Figure 4 As shown, the second limiting member 5 presses against the first limiting member 4 in a front-to-back direction, so that the first limiting member 4 presses against the first bearing 21 in a front-to-back direction. There is no need to use additional parts to press the first limiting member 4 backward, which helps to reduce the number of parts in the power tool 100, or to avoid using other parts to press the first limiting member 4 backward, so as to avoid modifying the structure of other parts and avoid increasing manufacturing costs.

[0086] Furthermore, such as Figure 4As shown, the second limiting member 5, the first limiting member 4, and the reduction gearbox 62 are distributed sequentially from front to back. The second limiting member 5 is connected to the reduction gearbox 62. In this scheme, the second limiting member 5 is fixed by the reduction gearbox 62, and the second limiting member 5 presses against the first limiting member 4 from behind, thereby restricting the first limiting member 4 and the second limiting member 5 from moving in the front-back direction. This allows the first limiting member 4 to stably prevent the first bearing 21 from moving forward, and the second limiting member 5 to stably prevent the operating member 31 from moving forward.

[0087] Furthermore, such as Figures 3 to 5 , Figure 8 As shown, the first limiting member 4 partially abuts against the gearbox 62. The power tool 100 also includes a fastener 7, which passes through the second limiting member 5 and the first limiting member 4 in sequence and is fastened to the gearbox 62 to ensure that the first limiting member 4 can press tightly against the first bearing 21 and to ensure that the second limiting member 5 can press tightly against the operating member 31, thus playing an effective limiting role.

[0088] Furthermore, the first limiting member 4 and the reduction gearbox 62 are connected by a first limiting hole 41 and a first limiting protrusion 621 to achieve pre-positioning and improve the assembly efficiency of the first limiting member 4. In one specific embodiment, as... Figure 4 and Figure 8 As shown, the first limiting member 4 has a first limiting hole 41, and the gearbox 62 has a first limiting protrusion 621. When assembling the first limiting member 4, the first limiting hole 41 is first aligned with the matching first limiting protrusion 621 and inserted to help determine the installation position of the first limiting member 4. Then, after assembling the second limiting member 5, it is fixed with fasteners 7. Of course, there can be multiple first limiting holes 41, and the first limiting protrusions 621 are set one-to-one with the first limiting holes 41. Alternatively, the first limiting member 4 can have a first limiting protrusion, and the gearbox 62 can have a first limiting hole.

[0089] Furthermore, the first limiting member 4 and the second limiting member 5 are connected by a second limiting hole 42 and a second limiting protrusion 55 to achieve pre-positioning and improve the assembly efficiency of the second limiting member 5. In one specific embodiment, as... Figure 4 , Figure 8 and Figure 9As shown, the first limiting member 4 has a second limiting hole 42, and the second limiting member 5 has a second limiting protrusion 55. When assembling the first limiting member 4 and the second limiting member 5, firstly, the first limiting hole 41 and the first limiting protrusion 621 are inserted together; then, the second limiting hole 42 and the second limiting protrusion 55 are aligned and inserted together; finally, fasteners 7 are used for fixing. Of course, there can be multiple second limiting holes 42, with each second limiting protrusion 55 corresponding to one of the second limiting holes 42. Alternatively, the first limiting member 4 can have a second limiting protrusion, and the second limiting member 5 can have a second limiting hole.

[0090] In one implementation, such as Figure 4 and Figure 9 As shown, the rear end of the second limiting member 5 is provided with an annular protrusion 51 and a first groove 52 surrounded by the annular protrusion 51. The annular protrusion 51 presses against the operating member 31 in a front-to-back direction, and the first limiting member 4 is at least partially embedded in the first groove 52. In this solution, while ensuring that the annular protrusion 51 has a certain thickness to stably limit the operating member 31, the first groove 52 is provided to at least partially accommodate the first limiting member 4, which helps to shorten the space occupied by the first limiting member 4 and the second limiting member 5 in the front-to-back direction, thereby helping to shorten the overall length of the power tool 100.

[0091] In one implementation, such as Figure 4 and Figure 8 As shown, the operating member 31 has a second groove 311 at its front end, and a first protrusion 3111 is provided in the second groove 311. The second limiting member 5 has a second protrusion 53, and the second limiting member 5 is at least partially embedded in the second groove 311. In this way, the operating member 31 can cover the second limiting member 5, improving the aesthetics of the power tool 100. Furthermore, the second limiting member 5 presses against the groove wall of the second groove 311 in a front-to-back direction, thereby preventing the operating member 31 from moving forward. In addition, when the operating member 31 is in the initial position, the second protrusion 53 abuts against the first protrusion 3111 in the rotatable direction of the operating member 31 to position the operating member 31 in its initial position, so that the operating member 31 can be accurately reset.

[0092] In one implementation, such as Figure 7 and Figure 8 As shown, the first limiting member 4 is annular. Both the first limiting member 4 and the first bearing 21 are annular, which helps to increase the contact area between the first limiting member 4 and the first bearing 21, thereby improving the stability of the first limiting member 4 in limiting the first bearing 21.

[0093] In one implementation, such as Figure 8As shown, the second limiting member 5 is annular, and the operating member 31 is cylindrical. The cross-sections of both the second limiting member 5 and the operating member 31 are annular, which helps to increase the contact area between the second limiting member 5 and the operating member 31, thereby improving the stability of the second limiting member 5 in limiting the operating member 31.

[0094] In one implementation, such as Figure 4 As shown, the projections of the first limiting member 4 and the shoulder 11 on the first plane overlap to maximize the protrusion height of the shoulder 11 and improve the stability of the shoulder 11 pressing forward against the chuck assembly 81. In one specific embodiment, both the shoulder 11 and the first limiting member 4 are annular, and the outer diameter of the shoulder 11 is larger than the inner diameter of the first limiting member 4.

[0095] In one implementation, such as Figures 2 to 4 , Figure 6 As shown, the chuck body 811 includes a quick-release hollow cylindrical portion 8111 and a clamping portion 8112, the clamping portion 8112 being used to clamp the tool head. A radial through hole 8113 is provided on the quick-release hollow cylindrical portion 8111, which is sleeved on the outer periphery of the output shaft 1, and abuts against the shoulder 11 in a front-to-back direction. The radial length of the portion of the quick-release hollow cylindrical portion 8111 that contacts the shoulder 11 (i.e., the protrusion height of the shoulder 11) of the quick-release hollow cylindrical portion 8111 is L1, and the wall thickness of the quick-release hollow cylindrical portion 8111 is t1. L1 is greater than or equal to half of t1 to ensure that the shoulder 11 can stably press forward against the chuck assembly 81, preventing the chuck assembly 81 from moving backward. Further, L1 is greater than or equal to 2mm.

[0096] In one embodiment, the power tool 100 further includes a second bearing 22 located behind the first bearing 21. The second bearing 22 is sleeved on the output shaft 1, and the first bearing 21 and the second bearing 22 cooperate to jointly support the output shaft 1.

[0097] In one embodiment, the operating member 31 is used for torque adjustment. Specifically, the power tool 100 also includes a clutch assembly 93 and a torque adjusting member 32. The clutch assembly 93 includes a clutch ball 931, a clutch spring 932, and a clutch washer 933. The clutch washer 933 is located between the clutch ball 931 and the clutch spring 932. The clutch ball 931 presses backward against the end face of the final stage internal gear ring 611 of the reduction mechanism 61. One end of the clutch spring 932 is connected to the torque adjusting member 32, and the other end abuts against the clutch washer 933. The inner wall of the operating member 31 is provided with an internal thread 312, and the outer wall of the torque adjusting member 32 is provided with an external thread 321. The torque adjusting member 32 is rotatably sleeved on the outer periphery of the reduction gearbox 62. When the user rotates the operating component 31, the torque adjusting component 32 can undergo a spiral motion to change the resistance of the torque adjusting component 32 to the clutch spring 932, thereby changing the resistance of the clutch spring 932 to the clutch shim 933, and ultimately changing the resistance of the clutch steel ball 931 to the final stage internal gear ring 611, thus realizing torque adjustment.

[0098] It should be understood that gear adjustment is achieved by adjusting the output speed of the reduction mechanism 61. The specific structure and principle can be found in any existing power tool (such as an electric drill), and will not be elaborated here.

[0099] Second Implementation Method

[0100] The following is based on Figures 9 to 11 The power tool in the second embodiment of this utility model is described in detail. The power tool in this embodiment has a similar structure to the power tool in the first embodiment, except that the chuck assembly 81 is different. The differences are mainly described below.

[0101] In one implementation, such as Figures 9 to 11As shown, the chuck assembly 81 is a corner clamp, which also includes a corner clamp housing 813 and a corner output shaft 814. The corner clamp housing 813 includes a first end 8131 and a second end 8132 whose extending directions intersect. The chuck body 811 is rotatably mounted in the first end 8131, and the corner output shaft 814 is rotatably mounted in the second end 8132. The corner output shaft 814 is used to clamp a tool head. One end of the chuck body 811 is quickly connected to the output shaft 1 via a locking element 812, and the other end of the chuck body 811 is in a transmission engagement with the corner output shaft 814. The first end 8131 is provided with a first tooth 81311, and the front end of the second limiting member 5 is provided with a second tooth 54. The second tooth 54 is used to engage with the first tooth 81311 to prevent the corner clamp housing 813 from rotating with the output shaft 1. The chuck body 811 cooperates with the angle output shaft 814 to transmit the rotational drive direction of the output shaft 1 to the tool head after changing the preset angle. In this solution, a second tooth 54 is provided on the second limiting member 5 to adapt to the angler housing 813, thereby enabling the power tool 100 to adapt to a variety of chuck assemblies 81 with different structures, making it widely applicable.

[0102] It should be explained that in this article, "the direction of the power tool 100 from front to back" refers to the direction parallel to the axis of the output shaft 1 and pointing from the torque output end 12 of the output shaft 1 to the torque input end 13 of the output shaft 1, and "the direction of the power tool 100 from back to front" refers to the opposite direction to "the direction of the power tool 100 from front to back".

[0103] It should be understood that the above embodiments are exemplary and are not intended to encompass all possible implementations included in the claims. Various modifications and changes can be made to the above embodiments without departing from the scope of this disclosure. Similarly, the various technical features of the above embodiments can be arbitrarily combined to form other embodiments of this utility model that may not be explicitly described. Therefore, the above embodiments only illustrate several implementations of this utility model and do not limit the scope of protection of this utility model patent.

Claims

1. A power tool, characterized in that, The power tool includes: An output shaft for driving the drill bit to rotate and having a shoulder and a mounting portion located in front of the shoulder; A first bearing is sleeved on the output shaft and located behind the shoulder; A chuck assembly is disposed at the mounting portion of the output shaft, and the chuck assembly abuts against the shoulder in a front-to-back direction of the power tool; An operating element that can be rotated to adjust the output state of the output shaft; A first limiting member is sleeved on the output shaft and presses against the first bearing in the direction from front to back of the power tool to prevent the first bearing from moving forward. The second limiting member is sleeved on the output shaft and presses against the operating member in the direction from front to back to prevent the operating member from moving forward; both the first limiting member and the second limiting member are located behind the shoulder. Specifically, the first plane is defined as a plane perpendicular to the axis of the output shaft, the projections of the second limiting member and the shoulder on the first plane do not overlap, and the projections of the first limiting member and the operating member on the first plane do not overlap.

2. The power tool according to claim 1, characterized in that, The power tool also includes: A speed reduction mechanism, the output end of which is used to drive the output shaft to rotate; A gearbox, which houses the reduction mechanism; The operating component is rotatably mounted on the gearbox in the front-to-back direction, and the outer peripheral wall of the first bearing is mounted on the inner wall of the gearbox.

3. The power tool according to claim 1, characterized in that, The second limiting member presses against the first limiting member in the front-to-back direction, so that the first limiting member presses against the first bearing in the front-to-back direction.

4. The power tool according to claim 3, characterized in that, The power tool also includes a reduction gearbox, and the second limiting member, the first limiting member, and the reduction gearbox are distributed sequentially along the front-to-back direction, with the second limiting member connected to the reduction gearbox.

5. The power tool according to claim 4, characterized in that, The first limiting member partially abuts against the gearbox; The power tool also includes fasteners that pass sequentially through the second limiting member and the first limiting member and are fastened to the gearbox.

6. The power tool according to claim 5, characterized in that, The first limiting member is connected to the gearbox through a first limiting hole and a first limiting protrusion to achieve positioning and pre-assembly. And / or, the first limiting member and the second limiting member are connected by a second limiting hole and a second limiting protrusion to achieve positioning pre-assembly; And / or, the rear end of the second limiting member is provided with an annular protrusion and a first groove surrounded by the annular protrusion, the annular protrusion abutting against the operating member in the direction from front to back, and the first limiting member is at least partially embedded in the first groove.

7. The power tool according to any one of claims 1-6, characterized in that, The front end of the operating component is provided with a second groove, and the second groove is provided with a first protrusion; The second limiting member has a second protrusion, and the second limiting member is at least partially embedded in the second groove. The second limiting member abuts against the groove wall of the second groove in the direction from front to back. When the operating member is in the initial position, the second protrusion abuts against the first protrusion along the rotatable direction of the operating member; And / or, the first limiting member is annular; And / or, the second limiting member is annular.

8. The power tool according to any one of claims 1-6, characterized in that, The projections of the first limiting member and the shoulder on the first plane overlap.

9. The power tool according to any one of claims 1-6, characterized in that, The chuck assembly includes a chuck body and a locking element. The chuck body abuts against the shoulder in the front-to-back direction. The chuck body has a radial through hole, and the locking element is movably inserted into the radial through hole. The locking element is used to radially press the output shaft inserted in the chuck body to lock the chuck assembly to the output shaft.

10. The power tool according to claim 9, characterized in that, The chuck body includes a quick-release hollow cylindrical part and a clamping part, the clamping part being used to clamp the tool head; the quick-release hollow cylindrical part is sleeved on the outer periphery of the output shaft, and it abuts against the shoulder in the front-to-back direction; the chuck assembly rotates with the output shaft. The length of the portion of the quick-assembly hollow cylinder that contacts the shoulder in the radial direction of the quick-assembly hollow cylinder is L1, and the wall thickness of the quick-assembly hollow cylinder is t1. L1 is greater than or equal to half of t1.

11. The power tool according to claim 8, characterized in that, The power tool also includes a cornering device having a first end and a second end that intersect in their extending directions, the first end being used to detachably mount the chuck assembly. The second end is provided with a first tooth, and the front end of the second limiting member is provided with a second tooth. The second tooth is used to engage with the first tooth to prevent the angler from rotating with the output shaft. The angler is used to change the rotational drive direction of the output shaft by a preset angle and then transmit it to the drill bit.

12. A power tool, characterized in that, The power tool includes: The output shaft is used to drive the drill bit to rotate and it is provided with a shoulder; A first bearing is sleeved on the output shaft and located behind the shoulder; An operating element that can be rotated to adjust the output state of the output shaft; A first limiting member is sleeved on the output shaft and presses against the first bearing in the direction from front to back of the power tool to prevent the first bearing from moving forward. The second limiting member is sleeved on the output shaft and presses against the operating member in the direction from front to back to prevent the operating member from moving forward; both the first limiting member and the second limiting member are located behind the shoulder. Specifically, the first plane is defined as a plane perpendicular to the axis of the output shaft, the projections of the second limiting member and the shoulder on the first plane do not overlap, and the projections of the first limiting member and the operating member on the first plane do not overlap.

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